When college students become doormen after graduation, they can start with their advantages. The advantages of being a janitor after graduation are: self-training, less work pressure, free working space, enlarged social circle and more contact with people, which is suitable for a second job during working hours, such as writing novels or other part-time jobs on the Internet. As a security guard, they can also learn a lot of manners and manners, such as dealing with people, having a large room for improvement, having more resources and having a wide network of contacts, and training every day can strengthen their health. The biggest advantage of being a security guard is that you can exert your unlimited possibilities in a limited time.